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[POWERPC] Move to runtime allocated exception stacks

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For the additonal exception levels (critical, debug, machine check) on
40x/book-e we were using "static" allocations of the stack in the
associated head.S.

Move to a runtime allocation to make the code a bit easier to read as
we mimic how we handle IRQ stacks.  Its also a bit easier to setup the
stack with a "dummy" thread_info in C code.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Kumar Gala
2008-04-30 03:49:55 -05:00
parent c054065bc1
commit bcf0b08807
7 changed files with 85 additions and 50 deletions
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24
arch/powerpc/kernel/setup_32.c
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@@ -248,6 +248,28 @@ static void __init irqstack_early_init(void)
#define irqstack_early_init()
#endif
#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
static void __init exc_lvl_early_init(void)
{
unsigned int i;
/* interrupt stacks must be in lowmem, we get that for free on ppc32
* as the lmb is limited to lowmem by LMB_REAL_LIMIT */
for_each_possible_cpu(i) {
critirq_ctx[i] = (struct thread_info *)
__va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
#ifdef CONFIG_BOOKE
dbgirq_ctx[i] = (struct thread_info *)
__va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
mcheckirq_ctx[i] = (struct thread_info *)
__va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
#endif
}
}
#else
#define exc_lvl_early_init()
#endif
/* Warning, IO base is not yet inited */
void __init setup_arch(char **cmdline_p)
{
@@ -305,6 +327,8 @@ void __init setup_arch(char **cmdline_p)
init_mm.end_data = (unsigned long) _edata;
init_mm.brk = klimit;
exc_lvl_early_init();
irqstack_early_init();
/* set up the bootmem stuff with available memory */